#side_menu ul{
    list-style: none;
}

#side_menu ul li a{
    color: black;
    text-decoration: none;
}

#side_menu ul li{
    background-color: orange;
    border: solid 1px;
    border-radius: 5px;
    text-align: center;
    margin: 5px 5px 10px 5px;
    box-shadow: 0px 5px 0px 0px #AAA;
}

#side_menu ul li:hover{
    box-shadow: 0px 0px 0px 0px #AAA;
}